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A merger in the dusty, z = 7.5 galaxy A1689-zD1?
Richard, Johan; Gallazzi, Anna; Knudsen, Kirsten K. +5 more
The gravitationally lensed galaxy A1689-zD1 is one of the most distant spectroscopically confirmed sources (z = 7.5). It is the earliest known galaxy where the interstellar medium (ISM) has been detected; dust emission was detected with the Atacama Large Millimetre Array (ALMA). A1689-zD1 is also unusual among high-redshift dust emitters as it is …
NGC 6819: testing the asteroseismic mass scale, mass loss and evidence for products of non-standard evolution
Chaplin, W. J.; Handberg, R.; Bossini, D. +5 more
We present an extensive peakbagging effort on Kepler data of ∼50 red giant stars in the open star cluster NGC 6819. By employing sophisticated pre-processing of the time series and Markov chain Monte Carlo techniques we extracted individual frequencies, heights and line widths for hundreds of oscillation modes. We show that the 'average' asterosei…
Relativistic deflection of background starlight measures the mass of a nearby white dwarf star
Brown, Thomas M.; Casertano, Stefano; Anderson, Jay +12 more
Gravitational deflection of starlight around the Sun during the 1919 total solar eclipse provided measurements that confirmed Einstein’s general theory of relativity. We have used the Hubble Space Telescope to measure the analogous process of astrometric microlensing caused by a nearby star, the white dwarf Stein 2051 B. As Stein 2051 B passed clo…
Protostellar and cometary detections of organohalogens
Bourke, Tyler L.; Rosina Team; Öberg, Karin I. +15 more
Organohalogens, a class of molecules that contain at least one halogen atom bonded to carbon, are abundant on the Earth where they are mainly produced through industrial and biological processes1. Consequently, they have been proposed as biomarkers in the search for life on exoplanets2. Simple halogen hydrides have been detec…
Accurate Distances to Important Spiral Galaxies: M63, M74, NGC 1291, NGC 4559, NGC 4625, and NGC 5398
Dolphin, Andrew E.; Skillman, Evan D.; Berg, Danielle +2 more
Accurate distances are fundamental for interpreting various measured properties of galaxies. Surprisingly, many of the best-studied spiral galaxies in the Local Volume have distance uncertainties that are much larger than can be achieved with modern observation techniques. Using Hubble Space Telescopeoptical imaging, we use the tip of the red gian…
The ISLAndS Project. II. The Lifetime Star Formation Histories of Six Andomeda dSphS
Ferguson, Henry C.; McQuinn, Kristen B. W.; Dolphin, Andrew E. +17 more
The Initial Star formation and Lifetimes of Andromeda Satellites (ISLAndS) project employs Hubble Space Telescope imaging to study a representative sample of six Andromeda dSph satellite companion galaxies. Our main goal is to determine whether the star formation histories (SFHs) of the Andromeda dSph satellites demonstrate significant statistical…
Search for sterile neutrinos in holographic dark energy cosmology: Reconciling Planck observation with the local measurement of the Hubble constant
Zhang, Jing-Fei; Zhang, Xin; He, Dong-Ze +1 more
We search for sterile neutrinos in the holographic dark energy cosmology by using the latest observational data. To perform the analysis, we employ the current cosmological observations, including the cosmic microwave background temperature power spectrum data from the Planck mission, the baryon acoustic oscillation measurements, the type Ia super…
Improved Dynamical Constraints on the Mass of the Central Black Hole in NGC 404
Williams, Benjamin F.; Caldwell, Nelson; Neumayer, Nadine +6 more
We explore the nucleus of the nearby 109 {M}⊙ early-type galaxy, NGC 404, using Hubble Space Telescope (HST)/STIS spectroscopy and WFC3 imaging. We first present evidence for nuclear variability in UV, optical, and infrared filters over a time period of 15 years. This variability adds to the already substantial evidence for …
Lyman continuum escape fraction of faint galaxies at z 3.3 in the CANDELS/GOODS-North, EGS, and COSMOS fields with LBC
Ryan, R. E.; O'Connell, R. W.; Dickinson, M. +41 more
Context. The reionization of the Universe is one of the most important topics of present-day astrophysical research. The most plausible candidates for the reionization process are star-forming galaxies, which according to the predictions of the majority of the theoretical and semi-analytical models should dominate the H I ionizing background at z …
A Complete ALMA Map of the Fomalhaut Debris Disk
MacGregor, Meredith A.; Hughes, A. Meredith; Kalas, Paul +14 more
We present ALMA mosaic observations at 1.3 mm (223 GHz) of the Fomalhaut system with a sensitivity of 14 µJy/beam. These observations provide the first millimeter map of the continuum dust emission from the complete outer debris disk with uniform sensitivity, enabling the first conclusive detection of apocenter glow. We adopt an MCMC modelin…